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Table 1 Expression of CRD genes under various levels of chromate stressa.

From: High-level chromate resistance in Arthrobactersp. strain FB24 requires previously uncharacterized accessory genes

CRD Gene

Basal Expression

In 0 mM Cr(VI)b × 102

Relative Fold Differencec

Cr(VI)/0 mM Cr(VI)

  

0.005

0.025

0.05

0.1

5

20

100

chrL

4.20

(0.45)

36.7*

(9.3)

95.2

(8.7)

69.8

(12.1)

95.1

(42.9)

63.4

(29.7)

45.1*

(14.3)

15.3*

(3.5)

chrA 6

2.25

(0.36)

8.5*

(1.3)

16.2*

(3.9)

27.4*

(2.5)

42.1

(4.2)

50.7

(14.5)

37.6

(9.8)

22.9

(8.2)

chrB-Cterm2

15.6

(4.95)

2.0*

(0.3)

2.2*

(0.5)

2.5*

(0.5)

7.1

(2.6)

6.3

(1.8)

8.0

(3.2)

2.0*

(0.8)

SCHR

8.50

(2.06)

1.9*

(0.5)

4.7*

(0.6)

5.1*

(0.7)

7.8

(0.7)

6.8

(1.9)

5.1

(1.2)

2.1*

(0.9)

chrK

21.9

(2.89)

3.7*

(0.5)

6.1*

(0.7)

7.5

(1.9)

10.1

(1.9)

7.2

(1.6)

6.9

(1.6)

4.4

(1.4)

chrB-Nterm

249

(86.4)

8.0

(2.6)

12.5

(4.0)

13.8

(5.6)

18.0

(8.0)

16.9

(7.1)

14.0

(6.5)

4.2

(1.5)

chrB-Cterm

0.51

(0.04)

4.3*

(0.7)

8.4*

(2.1)

16.0*

(1.5)

21.3

(2.0)

25.4

(4.4)

30.9

(6.0)

15.3

(5.5)

chrJ

1.23

(0.40)

7.2*

(1.5)

14.3*

(2.8)

19.0*

(2.5)

37.0

(15.0)

92.4

(47.2)

47.6

(13.2)

19.2

(6.7)

  1. a The basal (0 mM Cr(VI)) transcript levels are given in copy number/ng total RNA. For the remaining concentrations of Cr(VI), the average fold difference relative to the 0 mM Cr(VI) basal state is given. Bold values indicate the concentration at which maximum expression was observed. *, significantly different than the maximum expression level.
  2. b Mean transcript copy number/ng total RNA. SE is given in parentheses (n = 6).
  3. c Mean Fold Difference calculated by dividing the average transcript copy number in each Cr(VI) condition by the average transcript copy number in 0 mM Cr(VI). SE is given in parentheses (n = 6).